BigBattery 48V NEXUS-LiFePO4-300Ah-15kWh

Description

Nexus is the most affordable 15kWh LiFePO₄ off-grid powerhouses with a portable, compact build, and scalability to 225kWh for unstoppable outdoor home or cabin backup power.

Sleek & Compact Design

Our stackable, compact design comes with all the hardware you need for a straightforward setup, letting you get your off-grid system up and running efficiently in less time. Engineered for reliability in any off-grid environment, it delivers consistent power when you need it most.

Off-Grid Energy Reliability

With 300Ah of capacity, 100A continuous discharge, and peak support up to 110A, NEXUS handles high-demand loads with ease. NEXUS’s smart thermal management enables charging from 32 °F to 113 °F and discharging down to -4 °F, making it a true all-weather energy solution.

Modular ESS That Grows With You

NEXUS supports parallel expansion up to 15 units, offering 225kWh total capacity per inverter. With RS485, CAN, and RJ45 communication ports, it’s ready to integrate seamlessly into new or existing inverter systems—ensuring full system transparency, automation, and control.

Legacy Product Parallel Compatibility

The NEXUS is compatible and parallel-able with all existing KONG and GRIZ products purchased between 2019-2024.

Product Specifications

BigBattery 48V NEXUS-LiFePO4-300Ah-15kWh Product Specifications

Tech Specs

Battery Specifications	NEXUS 15KWh
SKU	F-NXUS-48150-G1
System Voltage	48V
Nominal Voltage	51.2V
Chemistry	LiFePO4
Usable Energy (kWh)	15kWh
Ah Capacity	300Ah
Cell Configuration	16S1P
Max Continuous Discharge	100A
Max Discharge Power	7.6kW
Max Discharge Peak	110A
Max Charge Current	100A
Charging Voltage Range	53.5V-57.6V
Operating Voltage Range	48V-57.6V
Max Charge Voltage	57.9V
Suggested Low Voltage Cutoff	50.8V
Charge Temp Range	0°C to 45°C
Discharge Temp Range	-20°C to 45°C
Optimal Discharge Temp	+15°C to +35°C
Storage Temp Range (SoC >50%)	-20°C~25°C
Humidity Range	10%-95% (No Condensation)
Weight (kg)	~142.8 kg ±5
Dimensions (WxHxD)	19.7 x 27.5 x 15.7 in (500×700×400 mm)
Altitude Limit	<2000m
Max Connections	15 in parallel (up to 225kWh)
Communications	RS485 / RJ45 / CAN
Protection Rating	IP21
Certifications	UN38.3
Installation	Indoor Floor-standing

What's included:

(3) X 5 ft Battery to Inverter Comm Cable
(6) x 4 AWG Red and Black Battery to Inverter Power Cables

Product Manual

BigBattery 48V NEXUS Product Manual

Product Warranty

BigBattery Warranty

BigBattery (12) YEAR LIMITED WARRANTY

In the unlikely event you are having an issue with one of our batteries, we have developed a straightforward Warranty & Return Policy servicing all customers in the USA:

Real (10) Year Warranty

All our batteries come with a 10-Year Full Repair/Replacement Warranty. If our batteries malfunction
due to component or manufacturing error, the product will be repaired or replaced free of charge.
Full Lifetime Tech Support & Customer Service

All batteries include a Free Lifetime Technical Support & Troubleshooting Service. If you have any
questions or need any help, simply call us at +1 (818) 280-3091 from 9am – 5pm, Monday – Friday, or
send us an email anytime at Support@BigBattery.com.
Free Repair & Replacement

All batteries are built to last a minimum of 10 years. We stand by the quality of our batteries. If any parts within our battery fail due to defects or manufacturing error within the next 10 years, we will fix or replace your battery free of charge. In addition, for the first year of the warranty we will even cover all shipping costs from/to your purchase address within the continental US.
Highest Quality Guarantee

BigBattery utilizes Tier 1 cells to provide the highest quality lithium battery packs in the USA. Depending on the model, use case and environment, your battery is designed to last between 3,500 – 8,000 cycles when used as intended within our published battery specifications.
Covered Products

This Warranty covers all battery packs from the “Date Of Purchase” from BigBattery for 10 years and
all accessories included for 30 Days.
Automated Warranty Registration

No warranty registration is needed. Warranties are automatically recorded via an internal customer
database via serial number and QR code.
Product Manuals & Specification Sheets

BigBattery provides a proprietary QR code on every battery. Scan this QR code with any phone to view
the Product Manual and Product Spec Sheet for your specific battery model. Providing these documents
to you in a digital format helps to protect our environment and provides you the most updated information
on your product in real time.
Domestic Warranty Claim Support

To start a warranty claim, please email us directly at Support@BigBattery.com to create a ticket. Include a written description of the problem and pictures if possible. Upon receipt, our Tech Support team will reach out to you within 24 – 48 hours to troubleshoot. If the battery has been purchased within a year if the issue being reported to BigBattery, you will be sent a Return Shipping Label at no cost. After the first year, you will have the option to pay for the shipping, or arrange your own shipping back to BigBattery. If the label is provided by BigBattery, please include a copy of this label in the return box or pallet when our 3rd party logistics provider arrives to pickup your return. All returns will be inspected prior to repair, replacement, or reimbursement, depending on the circumstances of return and availability of similar items. For detailed instructions, please review our Warranty Repair/Replacement Services section below.
Returning Accessories

This Warranty includes a 30-Day replacement for all accessories (Anderson connectors, wiring, chargers, etc.)
included with your battery. If product is not defective or damaged upon return, refunds will be offered based on
the purchase price of the unit minus a 20% restocking fee.
Change Your Mind

That’s OK! All our batteries come with a 30-Day money back guarantee. Returns will be subject to a 20% restocking
fee. Call or email customer service for a free shipping return label.
Non-Transferable

Our Warranty applies to the original owner. If you wish to transfer your Warranty to another party, you can do so
within 30 days of your purchase by sending a Warranty Transfer Request to Support@BigBattery.com.
Return Hazmat Fee

Due to the shipping regulations of lithium batteries, please note that some battery returns may require special
documentation and packaging, and these instances could encounter extra fees if a customer is attempting to
return a battery not covered by our Repair and Replacement Policy.
Battery Abuse Disclaimer

This warranty does not cover damages resulting from misuse, abuse, accidents, alterations, or improper charging/
installation of our product. Please scan the QR code on your battery and read the Manual prior to installation and
charging. DIY modifications or damage due to gross negligence or abuse will void your Warranty.
Fraud Protection

Repair, replacement, and refunds for your purchase will only be possible after your returned battery
has been received and fully inspected at our facility.
Limitation of Damages

In no event shall BigBattery, Inc. be liable for consequential damages due to breach of this Warranty.
Customer Satisfaction

If buyers are not satisfied for any reason after speaking with Level 3 Tech Support and/or our Customer Service team,
all original buyers may escalate dispute resolutions to our CTO for review. We aim to put our customers first, resolve
any issues, and ensure that all customers are happy with their purchase from BigBattery.

Rev. March 2023

Warranty Details

10-Year Repair/Replacement Warranty Coverage Details: BigBattery, Inc. warrants the covered product to be free of all defects in material and workmanship for 10 years from the auto-registered date of purchase. This Warranty extends to the original buyer for the duration of 10 years.

All BigBattery batteries are designed to operate for a minimum of 10 years and require zero maintenance. Some BigBattery batteries can last up to 22 years depending on model, use case, and environmental variables.

BigBattery batteries are also guaranteed to hold a reasonable amount of capacity based on the time in service (see exclusion for details on limits). In the case of a diminished capacity claim, the customer has the option to return the battery to BigBattery for capacity testing. The battery will be fully bench tested to resolve the claim and a relevant full cycle test report will be provided to the customer. If the customer is deemed to be correct and the battery is diminished beyond the limits specified in the exclusion section, then the battery will be eligible for warranty resolution. The customer will not be responsible for the costs associated with testing regardless of the test results.

Within our 10-Year Warranty, BigBattery, Inc. will repair or replace, free of charge, any part proving defective in material or workmanship. All warranty repairs and service must be performed by an authorized BigBattery, Inc. technician, or at an authorized BigBattery, Inc. service facility (unless directed otherwise in writing by a BigBattery employee).

For the first year, the expenses related to returning and repairing a defective part assumed by BigBattery, Inc. within the Continental US include pickup, return shipping, repair, replacement and final shipping. This Warranty does not assume responsibility for disconnection, service interruption, or re-packing expenses per said return shipment. Customers with international warranty claims will need to cover the cost of shipping.

Warranty Exclusions

This warranty does not apply to any costs, repairs, or services for the following:

On-site service calls from 3rd party.
Damage resulting from misuse, abuse, accidents, alterations, use other than intended application, collision,
dropping, or improper installation.
Product was used out of specification, or undersized for the application.
Environmental damage, including caustic substances, salty, or outdoor exposure unless the battery is specifically
indicated to be for outdoor use on the Product Label or in the Specification Sheet or the Product Manual.
Claims of diminished capacity of less than 12% in the first 5 years, or 25% from year 6 to the 10 year warranty period.
Corrective work necessitated by repairs made by anyone other than a BigBattery, authorized service technician
– if not previously advised by BigBattery Tech Support.
Battery that has not been charged over a six month Batteries need to be charged regularly to maximize and
maintain lifespan.
Warranty will be void if battery is opened, disassembled, or improperly altered, unless explicitly directed by
BigBattery for technical support.

Warranty Repair/Replacement Services

Contact BigBattery Tech Support, confirm the problem, and identify the solution with our team. If the battery needs to come back to BigBattery for repairs or parts replacement, Customer Service will offer to arrange to and from our repair facility.

The buyer is required to pack the product according to the directions provided by Customer Service. The buyer should carefully cover and pack the battery needing repair, preferably in the original packing materials, in the same format as previously delivered (box/pallet) together with a copy of the original purchase receipt. Please write descriptions and updated notes on the receipt to better assist Tech Support in processing your repair or replacement.

All emails, notes, and calls are saved to assist our team in providing a speedy resolution. If the shipping is arranged by BigBattery, BigBattery assumes all liability with their scheduled carrier for the safe transportation of this battery to and from our repair facility listed below:

Return Address:
BigBattery, Inc.
21314 Lassen Street
Chatsworth, CA. 91311

Product FAQs

BigBattery Frequently Ask Questions

Q1. Can your batteries be used in series?

A1. We no longer offer our batteries for use in series.

Q2. Do your batteries have a thermal management system?

A2. All of our batteries have a thermal management system that is controlled by the BMS (Battery Management System). This Thermal management system will not only prevent the battery from being used if the temperature is too high, but also if the temperature is also too low.

Q3. Can I use my OEM charger?

A3. No. Lead acid battery chargers charge at different currents and voltages than our lithium batteries. Using your OEM charger can damage your battery cells and void your battery’s 10 year warranty. We have several chargers optimized for and calibrated to every battery we sell.

Q4. Why does the voltage drop when unplugging the charger?

A4. The voltage drop that you experienced is called the “bubble voltage” and is perfectly normal for Lithium Batteries. LiFePO4 batteries behave differently than other battery chemistries. The Voltage vs Capacity is not linear. For example, if you have a voltage between (13.3 – 14.6) or (26.6 – 29.2) or (53.6 – 58.4) you will have more than 99% of the capacity. This essentially means that “Bubble Voltage” contains less than 1% of the entire capacity and the drop when a load is placed is instant.

Q5. Can I leave my batteries outside?

A5. No. Our batteries are not marine rated or weather proof, so leaving them out under the sun all day or in the rain can damage the batteries. (This type of damage is not covered under the 10 year warranty.

Q6. How many years will my battery last?

A6. Lithium Iron Phosphate (LifePO4) batteries can be cycled from 3000 to 7000 times. If you cycle the battery daily with an 80% DoD (Depth of Discharge), then you can get even more than 10 years of use from your battery.

Q7. How do I install my battery?

A7. All of our batteries come with free ring terminals that can be used to connect your battery to your inverter, cart, or busbar system. We also sell a parallel busbar that can be used in tandem with the included ring terminals to parallel multiple batteries.

Q8. What is the difference between the 12 A and the Upgraded Charger?

A8.

Upgraded Charger:

Charging Current: 15A
Input Voltage: 110V / 220V
Output Voltage: 58.8v
Charging Time: 5 h (approx)
On-Board Charger: Yes
Protection: IP65

12A Charger:

Charging Current: 12A
Input Voltage: 110 / 22V
Output Voltage: 45V,50.4V,58.8V
Charging Time: 6.5 h (approx)
On-Board Charger: No
Protection: IP50

Q9. Doe Big Battery sell used/surplus batteries?

A9. In the past Big Battery sold refurbished batteries, such as solar batteries made from recertified Nissan Leaf modules. As of the year 2020, all batteries sold are new, never-previously-cycled batteries that come with a complimentary 10 year warranty.

Q10. Do you ship outside of the United States of America?

A10. We only ship within the continental United States. All shipping is done via ground shipping methods. We recommend looking into a freight forwarder to receive shipments outside of the continental United States of America.

BigBattery 48V NEXUS-LiFePO4-300Ah-15kWh

Description

Sleek & Compact Design

Off-Grid Energy Reliability

Modular ESS That Grows With You

Legacy Product Parallel Compatibility

Product Specifications

BigBattery 48V NEXUS-LiFePO4-300Ah-15kWh Product Specifications

Tech Specs

Product Manual

BigBattery 48V NEXUS Product Manual

Product Warranty

BigBattery Warranty

BigBattery (12) YEAR LIMITED WARRANTY

Real (10) Year Warranty

Full Lifetime Tech Support & Customer Service

Free Repair & Replacement

Highest Quality Guarantee

Covered Products

Automated Warranty Registration

Product Manuals & Specification Sheets

Domestic Warranty Claim Support

Returning Accessories

Change Your Mind

Non-Transferable

Return Hazmat Fee

Battery Abuse Disclaimer

Fraud Protection

Limitation of Damages

Customer Satisfaction

Warranty Details

Warranty Exclusions

Warranty Repair/Replacement Services

Product FAQs

BigBattery Frequently Ask Questions

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